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Comment by Klonoar | Hacker News Reader

The inverse here - specifying {} directly - does not at a glance imply a default value is being constructed.

(Or perhaps it does and this is just some Ruby-ism I'm not exposed to)

That's kind of the point of default values, though. If you wanted to make a change to the method and you want it to break to alert you to all the calls, then you can add a keyword without adding a default value for it.

    def foo(kwargs = {}, frob:)
      kwargs
    end

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